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237


Range estimation by optical differentiation

Farid, H; Simoncelli, E P
We describe a novel formulation of the range recovery problem based on computation of the differential variation in image intensities with respect to changes in camera position. This method uses a single stationary camera and a pair of calibrated optical masks to measure this differential quantity directly. We also describe a variant based on changes in aperture size. The subsequent computation of the range image involves simple arithmetic operations and is suitable for real-time implementation. We present the theory of this technique and show results from a prototype camera that we have constructed
PMID: 9656478
ISSN: 1084-7529
CID: 143696

Derivation of a cortical normalization model from the statistics of natural images [Meeting Abstract]

Simoncelli, E. P.; Schwartz, O.
BIOSIS:PREV199800240970
ISSN: 0146-0404
CID: 372032

A model of neuronal responses in visual area MT

Simoncelli, E P; Heeger, D J
Electrophysiological studies indicate that neurons in the middle temporal (MT) area of the primate brain are selective for the velocity of visual stimuli. This paper describes a computational model of MT physiology, in which local image velocities are represented via the distribution of MT neuronal responses. The computation is performed in two stages, corresponding to neurons in cortical areas V1 and MT. Each stage computes a weighted linear sum of inputs, followed by rectification and divisive normalization. V1 receptive field weights are designed for orientation and direction selectivity. MT receptive field weights are designed for velocity (both speed and direction) selectivity. The paper includes computational simulations accounting for a wide range of physiological data, and describes experiments that could be used to further test and refine the model
PMID: 9604103
ISSN: 0042-6989
CID: 143695

Modeling MT neuronal responses to compound stimuli [Meeting Abstract]

Mikaelian, S.; Ferrera, V. P.; Simoncelli, E. P.
BIOSIS:PREV199900091976
ISSN: 0190-5295
CID: 367112

Statistical models for images: compression, restoration and synthesis

Chapter by: Simoncelli, E.P.
in: Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) by
Los Alamitos CA : IEEE, 1998
pp. 673-678
ISBN: 0-8186-8316-3
CID: 372042

Texture characterization via joint statistics of wavelet coefficient magnitudes

Chapter by: Simoncelli, Eero P; Portilla, J.
in: Proceedings 1998 International Conference on Image Processing. ICIP98 (Cat. No.98CB36269) by
Los Alamitos CA : IEEE, 1998
pp. 62-66
ISBN: 0-8186-8821-1
CID: 372052

Ecient Linear Re-rendering for Interactive Lighting Design

Teo, Patrick C; Simoncelli, Eero P; Heeger, David J
[s.l.] : Stanford University Department of Computer Science, 1997
Extent: 19 p.
ISBN: n/a
CID: 379382

Local translation detection: Evidence for velocity tuned pooling of spatio-temporal frequencies [Meeting Abstract]

Schrater, PR; Knill, DC; Simoncelli, EP
ISI:A1997WN21501179
ISSN: 0146-0404
CID: 367122

Efficient Linear Re-rendering for Interactive Lighting Design

Teo, Patrick C; Simoncelli, Eero P; Heeger, David J
[S.l.] : Stanford University Computer Science Dept, 1997
Extent: 17 p.
ISBN: n/a
CID: 367772

Optimally rotation-equivariant directional derivative kernels

Chapter by: Farid, H.; Simoncelli, Eero P
in: Computer Analysis of Images and Patterns. 7th International Conference, CAIP '97. Proceedings by
pp. 207-214
ISBN: 3-540-63460-6
CID: 372062